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https://hdl.handle.net/1959.11/4715
Title: | Quantifying the selection response using a residual feed intake DNA marker for two Australian breeding objectives | Contributor(s): | Wood, Ben (author); Van Der Werf, Julius Herman (author) ; Parnell, P F (author) | Publication Date: | 2005 | Handle Link: | https://hdl.handle.net/1959.11/4715 | Abstract: | A pseudo-BLUP index was used to evaluate the selection response from using a quantitative trait locus (QTL) for residual feed intake (RFI). The index included phenotypic information on the individual, sire, dam, half-sibs and progeny. To compare with marker-assisted selection (MAS), a single locus was assumed to be genotyped that explained a proportion of the variance for RFI and this was included in the selection index. Two breeding objectives were examined with a different relative economic value for RFI, one targeting the Australian domestic market and one targeting a high value Japanese export market. The selection response and optimal age structure altered with the inclusion of genotype information, Response was increased because the pre-selection accuracy, before RFI measurement, was improved. Genotyping increased the earlier selection of sires and decreased the optimum generation interval of sires; consequently, this increased the annual selection response. With a QTL that explained 0.33 phenotypic standard deviations of variance, response was shown to increase by up to II % when both sexes were genotyped and 7.6% when only males were genotyped. When sire selection was delayed until after 2 years of age, the increase in response from genotyping was 8.1% and 5.1%, respectively. If the QTL explained a relatively large part of the breeding objective, the locus was rapidly fixed resulting in rapid early gains. | Publication Type: | Conference Publication | Conference Details: | AAABG 2005: 16th Conference of the Association for the Advancement of Animal Breeding and Genetics, Noosa Lakes, Australia, 25th - 28th September, 2005 | Source of Publication: | Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.16, p. 169-172 | Place of Publication: | Collingwood, Australia | ISSN: | 1328-3227 | Fields of Research (FoR) 2008: | 070201 Animal Breeding | Socio-Economic Objective (SEO) 2008: | 830301 Beef Cattle | Peer Reviewed: | Yes | HERDC Category Description: | E1 Refereed Scholarly Conference Publication | Publisher/associated links: | http://trove.nla.gov.au/work/13321110 |
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Appears in Collections: | Conference Publication |
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